63 results about "Coupling impedance" patented technology

The invention relates to the technical field of connector regulation and control, and discloses an efficient energy storage connector dynamic regulation and control system based on a nonlinear coupling mechanism. The system comprises an establishment module used for establishing an energy storage connector system model based on a voltage signal and a current signal of an energy storage connector; the disturbance identification module is used for performing nonlinear coupling disturbance identification on the energy transmission process according to the energy storage connector system model to obtain an additional coupling loss component, a dynamic impedance drift component and a phase coupling offset component; the dynamic observation module is used for performing weighted analysis through a nonlinear coupling dynamic observer to obtain a coupling mechanism observation result; and the generation module is used for generating an energy transmission path regulation and control instruction containing the conduction angle compensation amount and the phase synchronization compensation amount based on the coupling mechanism observation result. According to the invention, stable operation can be realized under complex working conditions such as load abrupt change and coupling impedance fluctuation, and the transmission efficiency is maximized.

The invention relates to the technical field of power transmission, and discloses a transmission line bus resonance band effect path aggregation impedance analysis method, which comprises the following steps of S1, establishing a frequency impedance model for each path in a transmission line bus; s2, constructing a coupling impedance tensor to express the coupling effect between the paths; s3, according to the coupling impedance tensor, the spectral radius of the transmission line bus is calculated; s4, identifying the resonance band frequency band of the transmission line bus based on the change of the spectral radius of the transmission line bus; s5, generating equivalent impedance of path aggregation; and S6, outputting a frequency response spectrogram. According to the method, the spectral radius is calculated by establishing the frequency impedance model and combining the coupling impedance tensor and the complex impedance matrix, accurate recognition of the frequency band of the branching resonance band in the transmission line bus is achieved, complex impedance changes of multiple lines in the resonance frequency band can be captured, and then the accuracy and response speed of decentralized control over the bus are improved.

The invention relates to an impedance modeling method and device and computer equipment. Comprising the steps that disturbance voltage is injected to the alternating current side of a main circuit, a first relation between a modulation small signal and an alternating current small signal is obtained through alternating current control topology, the disturbance voltage and a phase angle small signal are correlated through a phase-locked loop, and a second relation between the modulation small signal and an alternating voltage small signal is determined; injecting disturbance voltage to the direct current side of the main circuit, and determining a third relationship between the modulation small signal and the alternating current small signal and a fourth relationship between the direct current small signals based on the alternating current control topology and the direct current control topology; and finally, impedance modeling is carried out in combination with a frequency small-signal model, so that self-impedance and coupling impedance characteristics of an alternating current side and a direct current side can be accurately reflected, and a basis is provided for analyzing system stability and optimizing a control strategy.

The invention discloses a method and a system for predicting crosstalk suppression performance of a shielded cable, and belongs to the field of power electronic electromagnetic interference. The method comprises the following steps: acquiring a common-mode interference source and common-mode source impedance of the inverter power supply, establishing a common-mode electromagnetic interference equivalent circuit of the inverter power supply, and combining a cable bundle equivalent circuit to construct a common-mode crosstalk model of a shielding cable in the inverter power supply system; equivalently replacing the distribution parameters between the cables with common coupling impedance, and updating the common-mode crosstalk model based on the common coupling impedance to obtain a shielding cable crosstalk suppression performance prediction model based on the shielding structure and the electromagnetic parameters; and acquiring the common-mode interference current ip on the current power cable of the equivalent circuit, predicting the common-mode crosstalk current of the shielded cable through the prediction model in combination with a preset shielding structure and electromagnetic parameters, and evaluating the crosstalk suppression performance of the shielded cable. The influence of different parameters of the shielded cable on common-mode crosstalk is quantified, and the crosstalk suppression performance of the shielded cable is accurately predicted.

The invention relates to the technical field of new energy power systems, in particular to a modeling method and device for a nonlinear frequency domain coupling impedance model of a new energy grid-connected system. The method comprises the steps of establishing an impedance model of the single-machine converter, analyzing a frequency sweeping result of the single-machine converter obtained in the impedance model establishing process according to the multi-time scale characteristic of a controller, obtaining an impedance characteristic analysis result of each frequency band, analyzing corresponding parameters of the impedance model under different frequency bands according to the impedance characteristic analysis result of each frequency band, and calculating the impedance model of the single-machine converter according to the parameters. According to the obtained impedance transfer function and parameters of each frequency band, establishing an output impedance mathematical model of the inverter under all working conditions; according to the output impedance mathematical model, the feeder equivalent impedance of the feeder from the tail end to the head end is determined, and the overall output impedance of the multiple parallel feeder lines at the collection cabinet is calculated. According to the method, the problems that a multi-dimensional coupling mechanism is not clear and the equivalent modeling precision needs to be improved in the process of expanding the single machine characteristics to the whole station level in the prior art can be solved.

The invention discloses an online calculation method and analysis system for coupling impedance between multi-feed direct current systems, and belongs to the technical field of high-voltage direct current transmission control. The online calculation method of the coupling impedance is provided for solving the problems that the coupling impedance of a multi-feed direct current system under large-scale new energy access is complex and changeable, and off-line calculation is difficult, and the method further comprises the steps that an equivalent model of the multi-feed high-voltage direct current power transmission system is constructed; on the basis of the equivalent model, the coupling impedance can be calculated in real time to use the electrical quantity in a steady state. The method not only can be used for researching the interactive coupling characteristic in a large power grid, but also can be used for analyzing the risk of an anticipated accident so as to cope with a complex and changeable operation mode of new energy.

The invention discloses a ceramic module ferrule series connection surge cut-off method and a surge protector thereof, and belongs to the technical field of surge protection.The method includes the steps that a surge protection loop formed by connecting a plurality of ceramic module ferrule units in series is constructed, and a surge absorption assembly and a thermal tripping assembly are arranged in each ferrule unit; when a surge event occurs, a nonlinear capacitive reactance migration factor and a longitudinal equivalent coupling impedance abrupt change rate of a surge absorption assembly in each insertion core unit are detected, whether a set cut-off threshold is reached or not is judged according to the nonlinear capacitive reactance migration factor and the longitudinal equivalent coupling impedance abrupt change rate, and a thermal tripping action is triggered to realize module-level circuit breaking; the position and response time of the cut-off event are recorded to the memory guide layer in a coding mode for subsequent non-contact scanning identification; after the system is recovered, the cut-off arm can be automatically reset through an external excitation mode to recover the conducting state; according to the invention, multiple technical effects of accurate surge response, event traceability and module reusability are realized, and the method is suitable for surge protection in high-density electronic equipment and an intelligent power system.

The invention discloses a converter frequency coupling impedance test and calculation method and system. The method comprises the following steps: selecting a disturbance source form according to the type of a to-be-tested converter, and constructing an impedance test circuit of a steady-state working point; a steady-state working point of the converter is simulated by adjusting parameters of a controlled source for the impedance test circuit, and a positive-sequence harmonic disturbance signal and a negative-sequence harmonic disturbance signal are injected in a superposed manner, so that a response signal is obtained; performing spectral analysis on the positive-sequence harmonic disturbance signal, the negative-sequence harmonic disturbance signal and the response signal, and calculating phasors and phase differences of power frequency and harmonic components; based on the phase difference, performing phase correction on a coupling component in the response signal to obtain a correction result; and calculating equivalent harmonic impedance by using a correction result, and outputting a frequency coupling matrix of the harmonic impedance of the converter in the full frequency band. By implementing the method provided by the invention, the impedance measurement requirements of various converters are met, so that the limitations of unclear initial phase, lack of physical concept of coupling impedance, difficulty in four-quadrant impedance measurement and calculation and the like in the traditional technology are overcome.

The present invention discloses a high-frequency helical slow-wave structure and a traveling wave tube, comprising a tube shell and a helical wire fixed in the tube shell by a clamping rod, wherein the helical wire and the tube shell are coaxially arranged; a loading structure is arranged on the inner wall of the tube shell, wherein the loading structure is a groove body formed by a depression of the inner wall of the tube shell, wherein the groove body spirally winds around the central axis of the tube shell on the inner wall of the tube shell to form a helical structure, and extends from one end of the tube shell to the other end of the tube shell. Compared with the existing slow-wave structure, the structure provided by the present invention improves the structure of the slow-wave structure, and by processing the loading structure inside the tube shell, the coupling impedance and output power of the slow-wave structure are improved, and the interaction coupling efficiency of the electron beam and the electromagnetic wave is further improved. In addition, the processing difficulty can be reduced, and a new technical direction is provided for the high-efficiency technology of space traveling wave tubes.

The application discloses an improved trapezoidal line slow wave structure and a traveling wave tube. The slow wave structure comprises a straight waveguide section, the straight waveguide section comprises a first coupling groove, a second coupling groove and an electron beam channel located in the middle of the first coupling groove and the second coupling groove along the direction of the central axis of the straight waveguide section; the width of the first coupling groove and the second coupling groove alternately changes on two adjacent metal plates of the slow wave structure, the transmission path of electromagnetic waves in the slow wave structure is prolonged, the phase velocity of electromagnetic waves in the slow wave structure is reduced, and then the bandwidth is extended. The traveling wave tube comprises the improved trapezoidal line slow wave structure. The application has the advantages of easy processing, good heat dissipation, wider bandwidth, higher coupling impedance and lower ohmic loss in the terahertz wave band, and solves the problems of narrow bandwidth, lower coupling impedance and larger loss of the traditional trapezoidal line slow wave structure.

The invention discloses an error control circuit and method for a voltage sensor in a solid-sealed polar pole, and the circuit comprises a high-voltage impedance network, a low-voltage impedance network, and a coupling impedance network, and the low-voltage impedance network comprises a first fixed impedance, a first adjustable impedance, a second fixed impedance, a second adjustable impedance, and a controllable electronic switch. The high-voltage impedance network is sequentially connected with the first fixed impedance, the first adjustable impedance and the second fixed impedance in series and then grounded, the second adjustable impedance is connected with the controllable electronic switch in series and then connected with the second fixed impedance in parallel, and the controllable electronic switch is controlled by the on-off state of a vacuum arc-extinguishing chamber in the solid-sealed polar pole to execute on-off. According to the invention, not only can the basic error of the voltage sensor in the opening or closing state of the vacuum arc-extinguishing chamber be eliminated, but also the error of the voltage sensor caused by the change of the opening or closing state of the vacuum arc-extinguishing chamber can be eliminated.

The application discloses a wide-frequency monitoring method and system based on equivalent DC impedance of a converter, and aims at the defects of the existing monitoring technology based on positive sequence harmonic impedance, such as unresolvable parameters, incapability of covering negative sequence and coupled impedance, and high false alarm and missed alarm rates. The monitoring is realized through the following steps: collecting DC element voltage of a grid-connected converter DC side, rectification side DC current and inversion side DC current signals; performing harmonic decomposition on the signals and extracting the main harmonic component with the largest amplitude; calculating the real part of the equivalent DC impedance of the rectification side and the inversion side; comparing the impedance real part with a set threshold value, and judging whether wide-frequency oscillation occurs in the system.

The application discloses a kind of MMC bipolar system direct current impedance modeling method and related device, belong to electrical engineering field, the modeling method has integrated alternating current coupling, control strategy dynamics and multi-frequency harmonic interaction by state space equation, the harmonic state space modeling framework presented can accurately analyze the influence of harmonic on direct current impedance, provides theoretical basis for system resonance suppression under weak power grid scene, the influence of the coupling part on circuit equation and modulation ratio transfer function in the AC side of converter station in bipolar system is considered, the state space equation of entire converter station is obtained;Using the relationship between input variable and state variable in harmonic state space equation, finally the direct current impedance matrix of bipolar system converter station is extracted, the modeling method presented in the application considers the generation mechanism of coupling impedance, establishes accurate mathematical model to characterize high-voltage direct current transmission system, lays an important foundation for stability analysis of the direct current side of converter station.

The invention discloses an all-metal slow-wave structure with a periodically slotted flat plate structure loaded with a rectangular waveguide, which is characterized in that a double-F-shaped slot structure is periodically etched on a metal flat plate, and the periodically slotted flat plate is embedded into the rectangular waveguide to form an all-metal slow-wave structure, so that a double-strip electron beam channel is formed. The structure greatly enhances the longitudinal field intensity at an electron beam channel, has higher coupling impedance than that of a conventional slow wave structure at the frequency band, keeps lower synchronous voltage, and can simultaneously realize synchronization of forward wave / backward wave regions. In addition, the structure also has the advantages of all-metal structure, open internal space, heat dissipation convenience, simple structure and easiness in processing. Therefore, the structure provided by the invention is particularly suitable for designing W-band traveling wave tube amplifiers or backward wave oscillators with relatively high interaction electron efficiency and output power.

The invention relates to the technical field of millimeter wave communication, in particular to a waveguide-microstrip probe transition structure integrated with a filtering function, which comprises a resonance unit, a microstrip probe, a dielectric substrate, an impedance conversion line, a microstrip transmission line, a grounding layer and a waveguide cavity, the resonance unit is used for generating a transmission zero signal, the microstrip probe is used for coupling the transmission zero signal, the impedance conversion line and the microstrip transmission line are used for leading out a coupling signal generated by the microstrip probe, and the dielectric substrate is used for carrying the resonance unit, the microstrip probe, the impedance conversion line and the microstrip transmission line; and the grounding layer is arranged on the back surface of the dielectric substrate and is connected with the waveguide cavity. The second resonance unit and the third resonance unit are designed to cooperatively generate a transmission zero point to form a transmission passband, and the first resonance unit is further designed to deepen the transmission zero point of an upper stop band so as to realize better filtering performance.

The invention relates to the technical field of electrical variable measurement, and discloses a remote calibration method and system for an electric energy meter, and the method comprises the steps: collecting load current data, calculating the fluctuation ratio of load current, and judging whether a calibration admission condition is satisfied or not; after the system judges that an access condition is met, accessing a new electric energy meter, monitoring voltage drop data of a contact point, performing transient variance cleaning to calculate a local voltage variance, and determining an effective calibration starting point; after the starting point is effectively calibrated, a coupling impedance model is constructed, and the real contact resistance of the wiring device is dynamically calculated; and performing true value correction on the voltage acquired by the new electric energy meter by using the true contact resistance, calculating a metering error, and judging whether the new electric energy meter is qualified or not according to the metering error. According to the invention, the influence of impedance thermal drift caused by hot plug mechanical oscillation and large current on metering can be effectively eliminated, and accurate replacement of the electric energy meter by large industrial and commercial households under the conditions of no power failure and no influence on metering is realized.

The invention belongs to the technical field of microwave electronics and electric vacuum, and particularly relates to a groove loading folded waveguide slow-wave structure with a vertical electronic channel, which comprises a shell, a slow-wave structure is arranged in the shell, and the slow-wave structure is formed by connecting a series of arc bent waveguides and straight waveguides end to end. The waveguide is equivalent to a folded waveguide formed by bending a rectangular waveguide in a U shape; an expanding groove which penetrates through the straight waveguide part and is self-adaptive along with bending deformation is formed in the middle line of the folded waveguide wall, and the expanding groove of the straight waveguide part is communicated with the folded waveguide cavity to form an electron beam channel. According to the invention, the expansion groove and the folded waveguide are conformally arranged, so that the maximum expansion of the size of an electron beam channel is realized, the electron beam with larger size can be borne, and the working power is improved. A coupling impedance analysis result shows that the folded waveguide slow wave structure has higher coupling impedance and can effectively improve gain and output power.

The invention discloses a harmonic characteristic analysis method of submarine cable grounding current, and relates to the technical field of power cable state monitoring. Aiming at the problems of poor adaptability, insufficient extraction precision, weak identification capability and the like of the existing harmonic analysis method, the method constructs a technical system from four dimensions of scene adaptation modeling, accurate signal extraction, feature root association and real-time dynamic adaptation. A three-dimensional coupling model of a seawater medium dynamic equivalent model and a composite grounding body coupling impedance model is established, a PSO-VMD and CEEMDAN combined algorithm is adopted to extract harmonic signals in a layered manner, a random forest algorithm is utilized to realize quantitative association of harmonic features and influence factors, and model parameters are corrected in combination with a dynamic adaptive mechanism. The method improves the precision and practicability of harmonic analysis under the complex working condition of the submarine cable, provides reliable support for defect diagnosis and state evaluation of the submarine cable, and is suitable for submarine cable monitoring of offshore power systems such as offshore wind power, offshore oil and gas platforms and the like.

The invention discloses a sub / super synchronous oscillation stability evaluation method and system for a multi-converter network, and the method comprises the steps: dividing a target multi-converter network grid-connected system into a to-be-researched network and a grid-connected point system according to the demands, respectively acquiring an aggregation frequency coupling admittance model of the network to be researched and an aggregation frequency coupling impedance model of the grid-connected point system side node network; based on the aggregation frequency coupling admittance model and the aggregation frequency coupling impedance model, calculating an equivalent single converter grid-connected system return rate matrix, and determining a characteristic value track of the equivalent single converter grid-connected system return rate matrix; and evaluating the subsynchronous / super-synchronous oscillation stability of the target multi-converter grid-connected system based on the characteristic value track. According to the method, for the multi-converter complex network, the frequency coupling characteristic under the control action of the converter is considered, and the efficiency and practicability of sub / super synchronous oscillation stability analysis of the multi-converter complex network grid-connected system are improved by applying the efficient aggregation method.

The application discloses a suspended and ridged microstrip line planar slow wave structure, which is different from a conventional suspended microstrip line slow wave structure, and is characterized in that a periodic metal U-shaped zigzag microstrip line is suspended, and a metal ridge is additionally arranged on a straight section of the microstrip line, so that a dielectric substrate on which the periodic ridged metal zigzag microstrip line is printed mainly plays a supporting role, electromagnetic waves are mainly distributed in vacuum cavities on the upper and lower sides of the dielectric substrate, and a strong longitudinal electric field distribution is formed above the periodic metal zigzag microstrip line, because the metal ridge is arranged on the straight section of the microstrip line, so that a larger coupling impedance can be further obtained, and the interaction efficiency of a microstrip line planar traveling wave tube amplifier is finally improved. Taking a W-band U-shaped periodic suspended metal zigzag microstrip line slow wave structure as an example, the coupling impedance at 96 GHz is increased by 194% by adding the ridge to the U-shaped periodic suspended metal zigzag microstrip line.

The invention discloses a converter near-power-frequency impedance measurement method, system and device and a storage medium, and the method comprises the steps: obtaining voltage-stabilized voltage / current data during the voltage-stabilized operation of a converter, and obtaining a first group of voltage / current data during the superposition of a voltage or current small-disturbance harmonic signal with the frequency f; the second group of voltage / current data is obtained when voltage or current small disturbance harmonic signals with the frequency of 2f0-f are superposed; aligning the first group of voltage / current data and the second group of voltage / current data with the steady-state voltage / current data through the first zero crossing point time deviation and the second zero crossing point time deviation, and then subtracting to obtain harmonic data; and calculating the sequence impedance and the coupling impedance of the converter at the frequency f and 2f0-f. According to the technical scheme, accurate measurement of the near-power-frequency impedance of the converter can be achieved, accurate harmonic analysis of a signal containing a power frequency component in a near-power-frequency band under the condition that the sampling law is met is achieved, the requirement for the sampling frequency is lowered, and accuracy and feasibility are both considered.

This invention discloses a control method for an ion cyclotron resonance heating system, belonging to the field of radio frequency heating control technology. This invention trains a coupling impedance prediction model using ICRH system operating parameters and plasma parameters, and outputs future coupling impedance prediction results during ICRH system operation to characterize the changing trend of the coupling state between the ICRH system and the plasma. During ICRH system operation, the signals required for the coupling impedance prediction model are acquired in real time to predict the matching state of the ICRH system. When the prediction results indicate a potential mismatch in the future coupling impedance, the impedance matching module in the ICRH system is preemptively adjusted to ensure that the ICRH system is always in an optimal matching state. This solves the technical problems of adjustment lag and transient mismatch inherent in existing technologies.

The invention discloses an MMC bipolar system direct current impedance modeling method and a related device, and belongs to the field of electrical engineering. The modeling method integrates alternating current circuit coupling, control strategy dynamic and multi-frequency harmonic interaction through a state-space equation; a proposed harmonic state space modeling framework can accurately analyze the influence of harmonic waves on direct current impedance, a theoretical basis is provided for system resonance suppression in a weak power grid scene, the influence of a converter station alternating current side coupling part in a bipolar system on a circuit equation and a modulation ratio transfer function is considered, and a state space equation of the whole converter station is obtained; according to the modeling method provided by the invention, the generation mechanism of coupling impedance is considered, an accurate mathematical model is established to represent the high-voltage direct-current power transmission system, and the high-voltage direct-current power transmission system has the advantages that the high-voltage direct-current power transmission system can be constructed; and an important foundation is laid for stability analysis of the DC side of the converter station.

This invention belongs to the field of water (oil) treatment technology. It discloses a water (oil) ion anti-agglomeration and scale inhibition system and method based on microcomputer-controlled frequency mixing. By acquiring real-time fluid operating parameters to generate initial dielectric disturbance characteristics, calculating the fluid residence time window and dividing it into multiple disturbance sub-windows, a microcomputer control chip dynamically splices triangular waves, sawtooth waves, and pulse waveforms to generate a frequency mixing excitation signal. This causes the excitation unit to generate field coupling around a purely physical flow channel without electrodes or magnets, implementing dielectric disturbance to interrupt (change) the ion aggregation trend. The system collects coupling impedance feedback signals in real time to determine the ion activity state and performs closed-loop correction of the carrier frequency of the frequency mixing excitation signal accordingly. This invention achieves highly efficient scale inhibition by precisely matching the characteristics of different media. Furthermore, it can remotely detect whether the microcomputer frequency mixing control is abnormal, avoiding the unnoticed equipment malfunctions caused by human error or power outages in traditional systems.

The application discloses a ceramic module plug-in core series surge cut-off method and a surge protector thereof, and belongs to the technical field of surge protection, which comprises a surge protection circuit composed of a plurality of ceramic module plug-in core units in series, wherein each plug-in core unit is provided with a surge absorption assembly and a thermal trip assembly; when a surge event occurs, the nonlinear capacitive reactance migration factor and the longitudinal equivalent coupling impedance mutation rate of the surge absorption assembly in each plug-in core unit are detected, and whether a set cut-off threshold is reached is judged according to the same, and a thermal trip action is triggered to realize module-level circuit breaking; the position and response time of the cut-off event are recorded to a memory guide layer in a coding mode for subsequent non-contact scanning identification; after the system is restored, the cut-off arm can be automatically reset through an external excitation mode to restore the conduction state; the application realizes multiple technical effects of accurate surge response, traceable events and reusable modules, and is suitable for surge protection in high-density electronic equipment and intelligent power systems.

This invention discloses a knowledge graph-based method and system for processing data on the impact of distribution network line losses, belonging to the field of data processing technology. The method includes: establishing a spatial coordinate system for the distribution network and dividing it into sub-regions; performing electrothermal coupling reasoning based on the knowledge graph to obtain dynamically corrected impedance and electricity consumption characteristic coordinates; calculating spatial drift dispersion and spatial drift penalty coefficient based on coordinate offset distance; obtaining the initial line loss impact degree based on the Joule heating cross-term model, combined with typical electricity consumption time differences; correcting this impact degree using the spatial drift penalty coefficient; and allocating topology weights according to betweenness centrality and dynamically corrected impedance, finally weighted aggregation to obtain the total line loss impact degree of the distribution network. This invention solves the problems of biased line loss assessment caused by existing assessments not considering electrothermal coupling impedance drift, time-asynchronous cross-heating, and unfused network topology, achieving accurate quantitative assessment of dynamic physical losses in distribution networks.

The present application relates to pipeline coupling impedance test technical field, especially a kind of pipeline coupling impedance test support device.It includes two symmetrically arranged halves, the opposite end surface of two halves is attached, two clamps are symmetrically arranged on the inner ring of two halves, the opposite end surface of two clamps is attached and is detachably connected into an entity by connecting piece;The front and rear two axial end surfaces of the half are detachably connected spring sheet one end by connecting piece, and the front and rear two axial end surfaces of the clamp of the inner ring of half are detachably connected the other end of spring sheet by connecting piece.The clamp of the present application can constrain the radial displacement of the measured sample, at the same time, spring sheet can provide smaller axial stiffness, during the coupling impedance test process, axial excitation can cause sufficient axial response for measurement.

The application relates to an impedance modeling method, device and computer equipment. The method comprises the following steps: injecting a disturbance voltage to an AC side of a main circuit, obtaining a first relationship between a small signal modulation and an AC current small signal through an AC control topology, and determining a second relationship between the small signal modulation and an AC voltage small signal through a phase-locked loop associated with the disturbance voltage and a phase angle small signal; injecting the disturbance voltage to a DC side of the main circuit, determining a third relationship between the small signal modulation and the AC current small signal and a fourth relationship between DC current small signals based on the AC control topology and a DC control topology; and finally, combining a frequency small signal model to perform impedance modeling, so as to accurately reflect self-impedance and coupling impedance characteristics of the AC side and the DC side, and provide a basis for analyzing system stability and optimizing a control strategy.

This application discloses a chip packaging structure, its fabrication method, and an electronic device. The chip packaging structure includes: a first connection layer having opposing upper and lower surfaces; a bare die disposed on the upper surface of the first connection layer; a first conductive structure disposed on the upper surface of the bare die; a first molding compound covering the bare die and the first conductive structure; and a redistribution layer disposed on the first molding compound. At least a portion of the first conductive structure is exposed on the upper surface of the first molding compound, and the redistribution layer is coupled to the first conductive structure. The signals from the bare die are directly led out through the first conductive structure and the redistribution layer, saving space, reducing wiring length and interconnect inductance, and achieving low-loss, high-efficiency signal interconnection between the bare dies. By using the redistribution layer to achieve signal interconnection between the bare dies, matching circuit wiring can be set in the redistribution layer according to the impedance value of the bare die, thereby eliminating the need for components such as capacitors used for coupling impedance, saving space, and reducing design complexity.

The present disclosure relates to a method for controlling a power converter coupled to an electrical grid. The method comprises the steps of obtaining output power of a power converter, electrical parameters of the power converter and electrical parameters of a power grid; determining a power control error based on the reference power and an output power of the power converter; determining a rotation frequency of an inertia model based on the inertia model taking the power control error as an input, the inertia model being a mathematical model of inertia of the machine; determining a phase angle based on a rotational frequency of the inertial model and at least one control signal generated by at least one parameter following at least one control path different from a control path including the inertial model, where the phase angle is a target angle between an electrical parameter of the power converter and an electrical parameter of the grid; determining a coupling impedance, the coupling impedance being a preset value determined prior to operation of the power converter; determining based on the difference phase angle in the two iterations and the difference output power of the power converter in the two iterations; and / or determining based on the determined phase angle and a reference expected phase angle; and controlling the power converter based on the phase angle and the coupling impedance. The disclosure also relates to a corresponding device and a computer readable medium.